Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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I have a craftsman 139.53990 garage door opener. The light on the pad is blinking rapidly and I dont know why or how to fix it.

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If you have the 3 button wall control press and hold the button with the lock icon for 3 seconds and release.

Posted on Sep 08, 2009

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I have a Craftsman Garage Door opener model # 139.53674SRT2. It is sporadically going up and down to varying degrees. The LED indicator on the back is constantly blinking. If I trip the motion sensor it...


Rapid blinking of that LED indicates it is receiving a signal. Make sure you don't have an old remote somewhere that is sending a signal and that your other remotes do not have a stuck switch. Remove the batteries and check that light.

Jul 17, 2011 | Sears Craftsman LiftMaster Chamberlain...

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I have a 1/2 hp craftsman opener. Remotes work fine. Wired wall unit has a blinking light on the open button and will not work Lock pad and light pad work but not the operate pad.????


Try pressing and holding the lock button for 3 seconds to stop the light from blinking. Your wall control may be bad. Usually when that light is blinking it is the remotes that will not work.

Jul 02, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My keypad works,my remote opener does not, even


It is related. One of the buttons on your wall control is the lock button and has a lock icon on it. Press and hold it for 3 seconds. The blinking should stop and your remote should now work.

Aug 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

L.E.D lights at back constantly blinking, garage door won't open


If the LED is blinking randomly it is normal. If it is blinking rapidly you have interference from somewhere. To eliminate any interference start unplugging anything electrical and watch the LED. Some things will interfere that you wouldn't even think of like a heater in an aquarium. Check everything especially in the garage.

Jun 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a craftsman garage door opener (1/2 hp) won't close proper


Check your door sensors. They have probably been bumped. Tweak them until they are pointed at one another and the small light on each one is lit and not blinking.

May 31, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener.Working off and on. Green light blinking


Check the alignment of the safety light beams near the floor on each side of the door. They are not properly aimed and the safety reverse feature will not allow the door to close properly.

Mar 10, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Do not know what the security code is on the key pad? How do I change it if I dont know the current number?


Your motor unit should have a learn button on it. Once you find this, follow the instructions below:

1-Press learn button on motor
2-Within 30 secs, enter a new 4 digit pin on key pad. Press and hold enter button.
3-Release enter button when lights blink on the motor unit.

Mar 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door pad


You need to press and release the learn botton (don't hold it or you will clear all the codes)
If the light bulb(s) on your operator are on the front and/or back, the learn botton is on the back of the operator. If the lights are on the sides of the operator then the learn botton is on the right side (looking from the back of the operator and facing the garage door). 
After you press the learn button you have about 30 seconds to press in the new 4 digit code in your key pad then hold the enter button until the light on the operator blinks (about 2 seconds). If this does not work check the battery and try it again.

Aug 04, 2008 | Sears Craftsman LiftMaster Chamberlain...

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